gcc/target.def

   1 /* Target hook definitions.
   2    Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
   3    2011, 2012
   4    Free Software Foundation, Inc.
   5
   6    This program is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published by the
   8    Free Software Foundation; either version 3, or (at your option) any
   9    later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; see the file COPYING3.  If not see
  18    <http://www.gnu.org/licenses/>.
  19
  20    In other words, you are welcome to use, share and improve this program.
  21    You are forbidden to forbid anyone else to use, share and improve
  22    what you give them.   Help stamp out software-hoarding!  */
  23
  24 /* See target-hooks-macros.h for details of macros that should be
  25    provided by the including file, and how to use them here.  */
  26 #include "target-hooks-macros.h"
  27
  28 #undef HOOK_TYPE
  29 #define HOOK_TYPE "Target Hook"
  30
  31 HOOK_VECTOR (TARGET_INITIALIZER, gcc_target)
  32
  33 /* Functions that output assembler for the target.  */
  34 #define HOOK_PREFIX "TARGET_ASM_"
  35 HOOK_VECTOR (TARGET_ASM_OUT, asm_out)
  36
  37 /* Opening and closing parentheses for asm expression grouping.  */
  38 DEFHOOKPOD
  39 (open_paren,
  40  "",
  41  const char *, "(")
  42 DEFHOOKPODX (close_paren, const char *, ")")
  43
  44 /* Assembler instructions for creating various kinds of integer object.  */
  45 DEFHOOKPOD
  46 (byte_op,
  47  "",
  48  const char *, "\t.byte\t")
  49 DEFHOOKPOD (aligned_op, "*", struct asm_int_op, TARGET_ASM_ALIGNED_INT_OP)
  50 DEFHOOKPOD (unaligned_op, "*", struct asm_int_op, TARGET_ASM_UNALIGNED_INT_OP)
  51
  52 /* The maximum number of bytes to skip when applying
  53    LABEL_ALIGN_AFTER_BARRIER.  */
  54 DEFHOOK
  55 (label_align_after_barrier_max_skip,
  56  "",
  57  int, (rtx label),
  58  default_label_align_after_barrier_max_skip)
  59
  60 /* The maximum number of bytes to skip when applying
  61    LOOP_ALIGN.  */
  62 DEFHOOK
  63 (loop_align_max_skip,
  64  "",
  65  int, (rtx label),
  66  default_loop_align_max_skip)
  67
  68 /* The maximum number of bytes to skip when applying
  69    LABEL_ALIGN.  */
  70 DEFHOOK
  71 (label_align_max_skip,
  72  "",
  73  int, (rtx label),
  74  default_label_align_max_skip)
  75
  76 /* The maximum number of bytes to skip when applying
  77    JUMP_ALIGN.  */
  78 DEFHOOK
  79 (jump_align_max_skip,
  80  "",
  81  int, (rtx label),
  82  default_jump_align_max_skip)
  83
  84 /* Try to output the assembler code for an integer object whose
  85    value is given by X.  SIZE is the size of the object in bytes and
  86    ALIGNED_P indicates whether it is aligned.  Return true if
  87    successful.  Only handles cases for which BYTE_OP, ALIGNED_OP
  88    and UNALIGNED_OP are NULL.  */
  89 DEFHOOK
  90 (integer,
  91  "",
  92  /* Only handles cases for which BYTE_OP, ALIGNED_OP and UNALIGNED_OP are
  93     NULL.  */
  94  bool, (rtx x, unsigned int size, int aligned_p),
  95  default_assemble_integer)
  96
  97 /* Output code that will globalize a label.  */
  98 DEFHOOK
  99 (globalize_label,
 100  "",
 101  void, (FILE *stream, const char *name),
 102  default_globalize_label)
 103
 104 /* Output code that will globalize a declaration.  */
 105 DEFHOOK
 106 (globalize_decl_name,
 107  "",
 108  void, (FILE *stream, tree decl), default_globalize_decl_name)
 109
 110 /* Output code that will emit a label for unwind info, if this
 111    target requires such labels.  Second argument is the decl the
 112    unwind info is associated with, third is a boolean: true if
 113    this is for exception handling, fourth is a boolean: true if
 114    this is only a placeholder for an omitted FDE.  */
 115 DEFHOOK
 116 (emit_unwind_label,
 117  "",
 118  void, (FILE *stream, tree decl, int for_eh, int empty),
 119  default_emit_unwind_label)
 120
 121 /* Output code that will emit a label to divide up the exception table.  */
 122 DEFHOOK
 123 (emit_except_table_label,
 124  "",
 125  void, (FILE *stream),
 126  default_emit_except_table_label)
 127
 128 /* Emit a directive for setting the personality for the function.  */
 129 DEFHOOK
 130 (emit_except_personality,
 131  "If the target implements @code{TARGET_ASM_UNWIND_EMIT}, this hook may be\
 132  used to emit a directive to install a personality hook into the unwind\
 133  info.  This hook should not be used if dwarf2 unwind info is used.",
 134  void, (rtx personality),
 135  NULL)
 136
 137 /* Emit any directives required to unwind this instruction.  */
 138 DEFHOOK
 139 (unwind_emit,
 140  "",
 141  void, (FILE *stream, rtx insn),
 142  NULL)
 143
 144 DEFHOOKPOD
 145 (unwind_emit_before_insn,
 146  "True if the @code{TARGET_ASM_UNWIND_EMIT} hook should be called before\
 147  the assembly for @var{insn} has been emitted, false if the hook should\
 148  be called afterward.",
 149  bool, true)
 150
 151 /* Generate an internal label.
 152    For now this is just a wrapper for ASM_GENERATE_INTERNAL_LABEL.  */
 153 DEFHOOK_UNDOC
 154 (generate_internal_label,
 155  "",
 156  void, (char *buf, const char *prefix, unsigned long labelno),
 157  default_generate_internal_label)
 158
 159 /* Output an internal label.  */
 160 DEFHOOK
 161 (internal_label,
 162  "",
 163  void, (FILE *stream, const char *prefix, unsigned long labelno),
 164  default_internal_label)
 165
 166 /* Output label for the constant.  */
 167 DEFHOOK
 168 (declare_constant_name,
 169  "",
 170  void, (FILE *file, const char *name, const_tree expr, HOST_WIDE_INT size),
 171  default_asm_declare_constant_name)
 172
 173 /* Emit a ttype table reference to a typeinfo object.  */
 174 DEFHOOK
 175 (ttype,
 176  "",
 177  bool, (rtx sym),
 178  hook_bool_rtx_false)
 179
 180 /* Emit an assembler directive to set visibility for the symbol
 181    associated with the tree decl.  */
 182 DEFHOOK
 183 (assemble_visibility,
 184  "",
 185  void, (tree decl, int visibility),
 186  default_assemble_visibility)
 187
 188 /* Output the assembler code for entry to a function.  */
 189 DEFHOOK
 190 (function_prologue,
 191  "",
 192  void, (FILE *file, HOST_WIDE_INT size),
 193  default_function_pro_epilogue)
 194
 195 /* Output the assembler code for end of prologue.  */
 196 DEFHOOK
 197 (function_end_prologue,
 198  "",
 199  void, (FILE *file),
 200  no_asm_to_stream)
 201
 202 /* Output the assembler code for start of epilogue.  */
 203 DEFHOOK
 204 (function_begin_epilogue,
 205  "",
 206  void, (FILE *file),
 207  no_asm_to_stream)
 208
 209 /* Output the assembler code for function exit.  */
 210 DEFHOOK
 211 (function_epilogue,
 212  "",
 213  void, (FILE *file, HOST_WIDE_INT size),
 214  default_function_pro_epilogue)
 215
 216 /* Initialize target-specific sections.  */
 217 DEFHOOK
 218 (init_sections,
 219  "",
 220  void, (void),
 221  hook_void_void)
 222
 223 /* Tell assembler to change to section NAME with attributes FLAGS.
 224    If DECL is non-NULL, it is the VAR_DECL or FUNCTION_DECL with
 225    which this section is associated.  */
 226 DEFHOOK
 227 (named_section,
 228  "",
 229  void, (const char *name, unsigned int flags, tree decl),
 230  default_no_named_section)
 231
 232 /* Return preferred text (sub)section for function DECL.
 233    Main purpose of this function is to separate cold, normal and hot
 234    functions. STARTUP is true when function is known to be used only
 235    at startup (from static constructors or it is main()).
 236    EXIT is true when function is known to be used only at exit
 237    (from static destructors).
 238    Return NULL if function should go to default text section.  */
 239 DEFHOOK
 240 (function_section,
 241  "",
 242  section *, (tree decl, enum node_frequency freq, bool startup, bool exit),
 243  default_function_section)
 244
 245 /* Output the assembler code for function exit.  */
 246 DEFHOOK
 247 (function_switched_text_sections,
 248  "Used by the target to emit any assembler directives or additional\
 249   labels needed when a function is partitioned between different\
 250   sections.  Output should be written to @var{file}.  The function\
 251   decl is available as @var{decl} and the new section is `cold' if\
 252   @var{new_is_cold} is @code{true}.",
 253  void, (FILE *file, tree decl, bool new_is_cold),
 254  default_function_switched_text_sections)
 255
 256 /* Return a mask describing how relocations should be treated when
 257    selecting sections.  Bit 1 should be set if global relocations
 258    should be placed in a read-write section; bit 0 should be set if
 259    local relocations should be placed in a read-write section.  */
 260 DEFHOOK
 261 (reloc_rw_mask,
 262  "",
 263  int, (void),
 264  default_reloc_rw_mask)
 265
 266  /* Return a section for EXP.  It may be a DECL or a constant.  RELOC
 267     is nonzero if runtime relocations must be applied; bit 1 will be
 268     set if the runtime relocations require non-local name resolution.
 269     ALIGN is the required alignment of the data.  */
 270 DEFHOOK
 271 (select_section,
 272  "",
 273  section *, (tree exp, int reloc, unsigned HOST_WIDE_INT align),
 274  default_select_section)
 275
 276 /* Return a section for X.  MODE is X's mode and ALIGN is its
 277    alignment in bits.  */
 278 DEFHOOK
 279 (select_rtx_section,
 280  "",
 281  section *, (enum machine_mode mode, rtx x, unsigned HOST_WIDE_INT align),
 282  default_select_rtx_section)
 283
 284 /* Select a unique section name for DECL.  RELOC is the same as
 285    for SELECT_SECTION.  */
 286 DEFHOOK
 287 (unique_section,
 288  "",
 289  void, (tree decl, int reloc),
 290  default_unique_section)
 291
 292 /* Return the readonly data section associated with function DECL.  */
 293 DEFHOOK
 294 (function_rodata_section,
 295  "",
 296  section *, (tree decl),
 297  default_function_rodata_section)
 298
 299 /* Nonnull if the target wants to override the default ".rodata" prefix
 300    for mergeable data sections.  */
 301 DEFHOOKPOD
 302 (mergeable_rodata_prefix,
 303  "Usually, the compiler uses the prefix @code{\".rodata\"} to construct\n\
 304 section names for mergeable constant data.  Define this macro to override\n\
 305 the string if a different section name should be used.",
 306  const char *, ".rodata")
 307
 308 /* Return the section to be used for transactional memory clone tables.  */
 309 DEFHOOK
 310 (tm_clone_table_section,
 311  "Return the section that should be used for transactional memory clone\
 312   tables.",
 313  section *, (void), default_clone_table_section)
 314
 315 /* Output a constructor for a symbol with a given priority.  */
 316 DEFHOOK
 317 (constructor,
 318  "",
 319  void, (rtx symbol, int priority), NULL)
 320
 321 /* Output a destructor for a symbol with a given priority.  */
 322 DEFHOOK
 323 (destructor,
 324  "",
 325  void, (rtx symbol, int priority), NULL)
 326
 327 /* Output the assembler code for a thunk function.  THUNK_DECL is the
 328    declaration for the thunk function itself, FUNCTION is the decl for
 329    the target function.  DELTA is an immediate constant offset to be
 330    added to THIS.  If VCALL_OFFSET is nonzero, the word at
 331    *(*this + vcall_offset) should be added to THIS.  */
 332 DEFHOOK
 333 (output_mi_thunk,
 334  "",
 335  void, (FILE *file, tree thunk_fndecl, HOST_WIDE_INT delta,
 336         HOST_WIDE_INT vcall_offset, tree function),
 337  NULL)
 338
 339 /* Determine whether output_mi_thunk would succeed.  */
 340 /* ??? Ideally, this hook would not exist, and success or failure
 341    would be returned from output_mi_thunk directly.  But there's
 342    too much undo-able setup involved in invoking output_mi_thunk.
 343    Could be fixed by making output_mi_thunk emit rtl instead of
 344    text to the output file.  */
 345 DEFHOOK
 346 (can_output_mi_thunk,
 347  "",
 348  bool, (const_tree thunk_fndecl, HOST_WIDE_INT delta,
 349         HOST_WIDE_INT vcall_offset, const_tree function),
 350  hook_bool_const_tree_hwi_hwi_const_tree_false)
 351
 352 /* Output any boilerplate text needed at the beginning of a
 353    translation unit.  */
 354 DEFHOOK
 355 (file_start,
 356  "",
 357  void, (void),
 358  default_file_start)
 359
 360 /* Output any boilerplate text needed at the end of a translation unit.  */
 361 DEFHOOK
 362 (file_end,
 363  "",
 364  void, (void),
 365  hook_void_void)
 366
 367 /* Output any boilerplate text needed at the beginning of an
 368    LTO output stream.  */
 369 DEFHOOK
 370 (lto_start,
 371  "",
 372  void, (void),
 373  hook_void_void)
 374
 375 /* Output any boilerplate text needed at the end of an
 376    LTO output stream.  */
 377 DEFHOOK
 378 (lto_end,
 379  "",
 380  void, (void),
 381  hook_void_void)
 382
 383 /* Output any boilerplace text needed at the end of a
 384    translation unit before debug and unwind info is emitted.  */
 385 DEFHOOK
 386 (code_end,
 387  "",
 388  void, (void),
 389  hook_void_void)
 390
 391 /* Output an assembler pseudo-op to declare a library function name
 392    external.  */
 393 DEFHOOK
 394 (external_libcall,
 395  "",
 396  void, (rtx symref),
 397  default_external_libcall)
 398
 399 /* Output an assembler directive to mark decl live. This instructs
 400    linker to not dead code strip this symbol.  */
 401 DEFHOOK
 402 (mark_decl_preserved,
 403  "",
 404  void, (const char *symbol),
 405  hook_void_constcharptr)
 406
 407 /* Output a record of the command line switches that have been passed.  */
 408 DEFHOOK
 409 (record_gcc_switches,
 410  "",
 411  int, (print_switch_type type, const char *text),
 412  NULL)
 413
 414 /* The name of the section that the example ELF implementation of
 415    record_gcc_switches will use to store the information.  Target
 416    specific versions of record_gcc_switches may or may not use
 417    this information.  */
 418 DEFHOOKPOD
 419 (record_gcc_switches_section,
 420  "",
 421  const char *, ".GCC.command.line")
 422
 423 /* Output the definition of a section anchor.  */
 424 DEFHOOK
 425 (output_anchor,
 426  "",
 427  void, (rtx x),
 428  default_asm_output_anchor)
 429
 430 DEFHOOK
 431 (output_ident,
 432  "Output a string based on @var{name}, suitable for the @samp{#ident} \
 433  directive, or the equivalent directive or pragma in non-C-family languages. \
 434  If this hook is not defined, nothing is output for the @samp{#ident} \
 435  directive.",
 436  void, (const char *name),
 437  hook_void_constcharptr)
 438
 439 /* Output a DTP-relative reference to a TLS symbol.  */
 440 DEFHOOK
 441 (output_dwarf_dtprel,
 442  "",
 443  void, (FILE *file, int size, rtx x),
 444  NULL)
 445
 446 /* Some target machines need to postscan each insn after it is output.  */
 447 DEFHOOK
 448 (final_postscan_insn,
 449  "",
 450  void, (FILE *file, rtx insn, rtx *opvec, int noperands),
 451  NULL)
 452
 453 /* Emit the trampoline template.  This hook may be NULL.  */
 454 DEFHOOK
 455 (trampoline_template,
 456  "",
 457  void, (FILE *f),
 458  NULL)
 459
 460 DEFHOOK
 461 (output_source_filename,
 462  "Output COFF information or DWARF debugging information which indicates\
 463  that filename @var{name} is the current source file to the stdio\
 464  stream @var{file}.\n\
 465  \n\
 466  This target hook need not be defined if the standard form of output\
 467  for the file format in use is appropriate.",
 468  void ,(FILE *file, const char *name),
 469  default_asm_output_source_filename)
 470
 471 DEFHOOK
 472 (output_addr_const_extra,
 473  "",
 474  bool, (FILE *file, rtx x),
 475  hook_bool_FILEptr_rtx_false)
 476
 477 /* ??? The TARGET_PRINT_OPERAND* hooks are part of the asm_out struct,
 478    even though that is not reflected in the macro name to override their
 479    initializers.  */
 480 #undef HOOK_PREFIX
 481 #define HOOK_PREFIX "TARGET_"
 482
 483 /* Emit a machine-specific insn operand.  */
 484 /* ??? tm.texi only documents the old macro PRINT_OPERAND,
 485    not this  hook, and uses a different name for the argument FILE.  */
 486 DEFHOOK_UNDOC
 487 (print_operand,
 488  "",
 489  void, (FILE *file, rtx x, int code),
 490  default_print_operand)
 491
 492 /* Emit a machine-specific memory address.  */
 493 /* ??? tm.texi only documents the old macro PRINT_OPERAND_ADDRESS,
 494    not this  hook, and uses different argument names.  */
 495 DEFHOOK_UNDOC
 496 (print_operand_address,
 497  "",
 498  void, (FILE *file, rtx addr),
 499  default_print_operand_address)
 500
 501 /* Determine whether CODE is a valid punctuation character for the
 502    `print_operand' hook.  */
 503 /* ??? tm.texi only documents the old macro PRINT_OPERAND_PUNCT_VALID_P,
 504    not this  hook.  */
 505 DEFHOOK_UNDOC
 506 (print_operand_punct_valid_p,
 507  "",
 508  bool ,(unsigned char code),
 509  default_print_operand_punct_valid_p)
 510
 511 /* Given a symbol name, perform same mangling as assemble_name and
 512    ASM_OUTPUT_LABELREF, returning result as an IDENTIFIER_NODE.  */
 513 DEFHOOK
 514 (mangle_assembler_name,
 515  "Given a symbol @var{name}, perform same mangling as @code{varasm.c}'s\
 516  @code{assemble_name}, but in memory rather than to a file stream, returning\
 517  result as an @code{IDENTIFIER_NODE}.  Required for correct LTO symtabs.  The\
 518  default implementation calls the @code{TARGET_STRIP_NAME_ENCODING} hook and\
 519  then prepends the @code{USER_LABEL_PREFIX}, if any.",
 520  tree, (const char *name),
 521  default_mangle_assembler_name)
 522
 523 HOOK_VECTOR_END (asm_out)
 524
 525 /* Functions relating to instruction scheduling.  All of these
 526    default to null pointers, which haifa-sched.c looks for and handles.  */
 527 #undef HOOK_PREFIX
 528 #define HOOK_PREFIX "TARGET_SCHED_"
 529 HOOK_VECTOR (TARGET_SCHED, sched)
 530
 531 /* Given the current cost, COST, of an insn, INSN, calculate and
 532    return a new cost based on its relationship to DEP_INSN through
 533    the dependence LINK.  The default is to make no adjustment.  */
 534 DEFHOOK
 535 (adjust_cost,
 536  "",
 537  int, (rtx insn, rtx link, rtx dep_insn, int cost), NULL)
 538
 539 /* Adjust the priority of an insn as you see fit.  Returns the new priority.  */
 540 DEFHOOK
 541 (adjust_priority,
 542  "",
 543  int, (rtx insn, int priority), NULL)
 544
 545 /* Function which returns the maximum number of insns that can be
 546    scheduled in the same machine cycle.  This must be constant
 547    over an entire compilation.  The default is 1.  */
 548 DEFHOOK
 549 (issue_rate,
 550  "",
 551  int, (void), NULL)
 552
 553 /* Calculate how much this insn affects how many more insns we
 554    can emit this cycle.  Default is they all cost the same.  */
 555 DEFHOOK
 556 (variable_issue,
 557  "",
 558  int, (FILE *file, int verbose, rtx insn, int more), NULL)
 559
 560 /* Initialize machine-dependent scheduling code.  */
 561 DEFHOOK
 562 (init,
 563  "",
 564  void, (FILE *file, int verbose, int max_ready), NULL)
 565
 566 /* Finalize machine-dependent scheduling code.  */
 567 DEFHOOK
 568 (finish,
 569  "",
 570  void, (FILE *file, int verbose), NULL)
 571
 572  /* Initialize machine-dependent function wide scheduling code.  */
 573 DEFHOOK
 574 (init_global,
 575  "",
 576  void, (FILE *file, int verbose, int old_max_uid), NULL)
 577
 578 /* Finalize machine-dependent function wide scheduling code.  */
 579 DEFHOOK
 580 (finish_global,
 581  "",
 582  void, (FILE *file, int verbose), NULL)
 583
 584 /* Reorder insns in a machine-dependent fashion, in two different
 585        places.  Default does nothing.  */
 586 DEFHOOK
 587 (reorder,
 588  "",
 589  int, (FILE *file, int verbose, rtx *ready, int *n_readyp, int clock), NULL)
 590
 591 DEFHOOK
 592 (reorder2,
 593  "",
 594  int, (FILE *file, int verbose, rtx *ready, int *n_readyp, int clock), NULL)
 595
 596 /* The following member value is a pointer to a function called
 597    after evaluation forward dependencies of insns in chain given
 598    by two parameter values (head and tail correspondingly).  */
 599 DEFHOOK
 600 (dependencies_evaluation_hook,
 601  "",
 602  void, (rtx head, rtx tail), NULL)
 603
 604 /* The values of the following four members are pointers to functions
 605    used to simplify the automaton descriptions.  dfa_pre_cycle_insn and
 606    dfa_post_cycle_insn give functions returning insns which are used to
 607    change the pipeline hazard recognizer state when the new simulated
 608    processor cycle correspondingly starts and finishes.  The function
 609    defined by init_dfa_pre_cycle_insn and init_dfa_post_cycle_insn are
 610    used to initialize the corresponding insns.  The default values of
 611    the members result in not changing the automaton state when the
 612    new simulated processor cycle correspondingly starts and finishes.  */
 613
 614 DEFHOOK
 615 (init_dfa_pre_cycle_insn,
 616  "",
 617  void, (void), NULL)
 618
 619 DEFHOOK
 620 (dfa_pre_cycle_insn,
 621  "",
 622  rtx, (void), NULL)
 623
 624 DEFHOOK
 625 (init_dfa_post_cycle_insn,
 626  "",
 627  void, (void), NULL)
 628
 629 DEFHOOK
 630 (dfa_post_cycle_insn,
 631  "",
 632  rtx, (void), NULL)
 633
 634 /* The values of the following two members are pointers to
 635    functions used to simplify the automaton descriptions.
 636    dfa_pre_advance_cycle and dfa_post_advance_cycle are getting called
 637    immediately before and after cycle is advanced.  */
 638
 639 DEFHOOK
 640 (dfa_pre_advance_cycle,
 641  "",
 642  void, (void), NULL)
 643
 644 DEFHOOK
 645 (dfa_post_advance_cycle,
 646  "",
 647  void, (void), NULL)
 648
 649 /* The following member value is a pointer to a function returning value
 650    which defines how many insns in queue `ready' will we try for
 651    multi-pass scheduling.  If the member value is nonzero and the
 652    function returns positive value, the DFA based scheduler will make
 653    multi-pass scheduling for the first cycle.  In other words, we will
 654    try to choose ready insn which permits to start maximum number of
 655    insns on the same cycle.  */
 656 DEFHOOK
 657 (first_cycle_multipass_dfa_lookahead,
 658  "",
 659  int, (void), NULL)
 660
 661 /* The following member value is pointer to a function controlling
 662    what insns from the ready insn queue will be considered for the
 663    multipass insn scheduling.  If the hook returns zero for insn
 664    passed as the parameter, the insn will be not chosen to be issued.  */
 665 DEFHOOK
 666 (first_cycle_multipass_dfa_lookahead_guard,
 667  "",
 668  int, (rtx insn), NULL)
 669
 670 /* This hook prepares the target for a new round of multipass
 671    scheduling.
 672    DATA is a pointer to target-specific data used for multipass scheduling.
 673    READY_TRY and N_READY represent the current state of search in the
 674    optimization space.  The target can filter out instructions that
 675    should not be tried during current round by setting corresponding
 676    elements in READY_TRY to non-zero.
 677    FIRST_CYCLE_INSN_P is true if this is the first round of multipass
 678    scheduling on current cycle.  */
 679 DEFHOOK
 680 (first_cycle_multipass_begin,
 681  "",
 682  void, (void *data, char *ready_try, int n_ready, bool first_cycle_insn_p),
 683  NULL)
 684
 685 /* This hook is called when multipass scheduling evaluates instruction INSN.
 686    DATA is a pointer to target-specific data that can be used to record effects
 687    of INSN on CPU that are not described in DFA.
 688    READY_TRY and N_READY represent the current state of search in the
 689    optimization space.  The target can filter out instructions that
 690    should not be tried after issuing INSN by setting corresponding
 691    elements in READY_TRY to non-zero.
 692    INSN is the instruction being evaluated.
 693    PREV_DATA is a pointer to target-specific data corresponding
 694    to a state before issuing INSN.  */
 695 DEFHOOK
 696 (first_cycle_multipass_issue,
 697  "",
 698  void, (void *data, char *ready_try, int n_ready, rtx insn,
 699         const void *prev_data), NULL)
 700
 701 /* This hook is called when multipass scheduling backtracks from evaluation of
 702    instruction corresponding to DATA.
 703    DATA is a pointer to target-specific data that stores the effects
 704    of instruction from which the algorithm backtracks on CPU that are not
 705    described in DFA.
 706    READY_TRY and N_READY represent the current state of search in the
 707    optimization space.  The target can filter out instructions that
 708    should not be tried after issuing INSN by setting corresponding
 709    elements in READY_TRY to non-zero.  */
 710 DEFHOOK
 711 (first_cycle_multipass_backtrack,
 712  "",
 713  void, (const void *data, char *ready_try, int n_ready), NULL)
 714
 715 /* This hook notifies the target about the result of the concluded current
 716    round of multipass scheduling.
 717    DATA is a pointer.
 718    If DATA is non-NULL it points to target-specific data used for multipass
 719    scheduling which corresponds to instruction at the start of the chain of
 720    the winning solution.  DATA is NULL when multipass scheduling cannot find
 721    a good enough solution on current cycle and decides to retry later,
 722    usually after advancing the cycle count.  */
 723 DEFHOOK
 724 (first_cycle_multipass_end,
 725  "",
 726  void, (const void *data), NULL)
 727
 728 /* This hook is called to initialize target-specific data for multipass
 729    scheduling after it has been allocated.
 730    DATA is a pointer to target-specific data that stores the effects
 731    of instruction from which the algorithm backtracks on CPU that are not
 732    described in DFA.  */
 733 DEFHOOK
 734 (first_cycle_multipass_init,
 735  "",
 736  void, (void *data), NULL)
 737
 738 /* This hook is called to finalize target-specific data for multipass
 739    scheduling before it is deallocated.
 740    DATA is a pointer to target-specific data that stores the effects
 741    of instruction from which the algorithm backtracks on CPU that are not
 742    described in DFA.  */
 743 DEFHOOK
 744 (first_cycle_multipass_fini,
 745  "",
 746  void, (void *data), NULL)
 747
 748 /* The following member value is pointer to a function called by
 749    the insn scheduler before issuing insn passed as the third
 750    parameter on given cycle.  If the hook returns nonzero, the
 751    insn is not issued on given processors cycle.  Instead of that,
 752    the processor cycle is advanced.  If the value passed through
 753    the last parameter is zero, the insn ready queue is not sorted
 754    on the new cycle start as usually.  The first parameter passes
 755    file for debugging output.  The second one passes the scheduler
 756    verbose level of the debugging output.  The forth and the fifth
 757    parameter values are correspondingly processor cycle on which
 758    the previous insn has been issued and the current processor cycle.  */
 759 DEFHOOK
 760 (dfa_new_cycle,
 761  "",
 762  int, (FILE *dump, int verbose, rtx insn, int last_clock,
 763        int clock, int *sort_p),
 764  NULL)
 765
 766 /* The following member value is a pointer to a function called by the
 767    insn scheduler.  It should return true if there exists a dependence
 768    which is considered costly by the target, between the insn
 769    DEP_PRO (&_DEP), and the insn DEP_CON (&_DEP).  The first parameter is
 770    the dep that represents the dependence between the two insns.  The
 771    second argument is the cost of the dependence as estimated by
 772    the scheduler.  The last argument is the distance in cycles
 773    between the already scheduled insn (first parameter) and the
 774    second insn (second parameter).  */
 775 DEFHOOK
 776 (is_costly_dependence,
 777  "",
 778  bool, (struct _dep *_dep, int cost, int distance), NULL)
 779
 780 DEFHOOK_UNDOC
 781 (adjust_cost_2,
 782  "Given the current cost, @var{cost}, of an insn, @var{insn}, calculate and\
 783  return a new cost based on its relationship to @var{dep_insn} through the\
 784  dependence of weakness @var{dw}.  The default is to make no adjustment.",
 785  int, (rtx insn, int dep_type1, rtx dep_insn, int cost, int dw), NULL)
 786
 787 /* The following member value is a pointer to a function called
 788    by the insn scheduler. This hook is called to notify the backend
 789    that new instructions were emitted.  */
 790 DEFHOOK
 791 (h_i_d_extended,
 792  "",
 793  void, (void), NULL)
 794
 795 /* Next 5 functions are for multi-point scheduling.  */
 796
 797 /* Allocate memory for scheduler context.  */
 798 DEFHOOK
 799 (alloc_sched_context,
 800  "",
 801  void *, (void), NULL)
 802
 803 /* Fills the context from the local machine scheduler context.  */
 804 DEFHOOK
 805 (init_sched_context,
 806  "",
 807  void, (void *tc, bool clean_p), NULL)
 808
 809 /* Sets local machine scheduler context to a saved value.  */
 810 DEFHOOK
 811 (set_sched_context,
 812  "",
 813  void, (void *tc), NULL)
 814
 815 /* Clears a scheduler context so it becomes like after init.  */
 816 DEFHOOK
 817 (clear_sched_context,
 818  "",
 819  void, (void *tc), NULL)
 820
 821 /* Frees the scheduler context.  */
 822 DEFHOOK
 823 (free_sched_context,
 824  "",
 825  void, (void *tc), NULL)
 826
 827 /* The following member value is a pointer to a function called
 828    by the insn scheduler.
 829    The first parameter is an instruction, the second parameter is the type
 830    of the requested speculation, and the third parameter is a pointer to the
 831    speculative pattern of the corresponding type (set if return value == 1).
 832    It should return
 833    -1, if there is no pattern, that will satisfy the requested speculation type,
 834    0, if current pattern satisfies the requested speculation type,
 835    1, if pattern of the instruction should be changed to the newly
 836    generated one.  */
 837 DEFHOOK
 838 (speculate_insn,
 839  "",
 840  int, (rtx insn, int request, rtx *new_pat), NULL)
 841
 842 /* The following member value is a pointer to a function called
 843    by the insn scheduler.  It should return true if the check instruction
 844    passed as the parameter needs a recovery block.  */
 845 DEFHOOK
 846 (needs_block_p,
 847  "",
 848  bool, (int dep_status), NULL)
 849
 850 /* The following member value is a pointer to a function called
 851    by the insn scheduler.  It should return a pattern for the check
 852    instruction.
 853    The first parameter is a speculative instruction, the second parameter
 854    is the label of the corresponding recovery block (or null, if it is a
 855    simple check).  If the mutation of the check is requested (e.g. from
 856    ld.c to chk.a), the third parameter is true - in this case the first
 857    parameter is the previous check.  */
 858 DEFHOOK
 859 (gen_spec_check,
 860  "",
 861  rtx, (rtx insn, rtx label, int mutate_p), NULL)
 862
 863 /* The following member value is a pointer to a function controlling
 864    what insns from the ready insn queue will be considered for the
 865    multipass insn scheduling.  If the hook returns zero for the insn
 866    passed as the parameter, the insn will not be chosen to be
 867    issued.  This hook is used to discard speculative instructions,
 868    that stand at the first position of the ready list.  */
 869 DEFHOOK
 870 (first_cycle_multipass_dfa_lookahead_guard_spec,
 871  "",
 872  bool, (const_rtx insn), NULL)
 873
 874 /* The following member value is a pointer to a function that provides
 875    information about the speculation capabilities of the target.
 876    The parameter is a pointer to spec_info variable.  */
 877 DEFHOOK
 878 (set_sched_flags,
 879  "",
 880  void, (struct spec_info_def *spec_info), NULL)
 881
 882 DEFHOOK_UNDOC
 883 (get_insn_spec_ds,
 884  "Return speculation types of instruction @var{insn}.",
 885  int, (rtx insn), NULL)
 886
 887 DEFHOOK_UNDOC
 888 (get_insn_checked_ds,
 889  "Return speculation types that are checked for instruction @var{insn}",
 890  int, (rtx insn), NULL)
 891
 892 DEFHOOK_UNDOC
 893 (skip_rtx_p,
 894  "Return bool if rtx scanning should just skip current layer and\
 895  advance to the inner rtxes.",
 896  bool, (const_rtx x), NULL)
 897
 898 /* The following member value is a pointer to a function that provides
 899    information about the target resource-based lower bound which is
 900    used by the swing modulo scheduler.  The parameter is a pointer
 901    to ddg variable.  */
 902 DEFHOOK
 903 (sms_res_mii,
 904  "",
 905  int, (struct ddg *g), NULL)
 906
 907 /* The following member value is a function that initializes dispatch
 908    schedling and adds instructions to dispatch window according to its
 909    parameters.  */
 910 DEFHOOK
 911 (dispatch_do,
 912 "",
 913 void, (rtx insn, int x),
 914 hook_void_rtx_int)
 915
 916 /* The following member value is a a function that returns true is
 917    dispatch schedling is supported in hardware and condition passed
 918    as the second parameter is true.  */
 919 DEFHOOK
 920 (dispatch,
 921 "",
 922 bool, (rtx insn, int x),
 923 hook_bool_rtx_int_false)
 924
 925 DEFHOOKPOD
 926 (exposed_pipeline,
 927 "True if the processor has an exposed pipeline, which means that not just\n\
 928 the order of instructions is important for correctness when scheduling, but\n\
 929 also the latencies of operations.",
 930 bool, false)
 931
 932 /* The following member value is a function that returns number
 933    of operations reassociator should try to put in parallel for
 934    statements of the given type.  By default 1 is used.  */
 935 DEFHOOK
 936 (reassociation_width,
 937 "This hook is called by tree reassociator to determine a level of\n\
 938 parallelism required in output calculations chain.",
 939 int, (unsigned int opc, enum machine_mode mode),
 940 hook_int_uint_mode_1)
 941
 942 HOOK_VECTOR_END (sched)
 943
 944 /* Functions relating to vectorization.  */
 945 #undef HOOK_PREFIX
 946 #define HOOK_PREFIX "TARGET_VECTORIZE_"
 947 HOOK_VECTOR (TARGET_VECTORIZE, vectorize)
 948
 949 /* The following member value is a pointer to a function called
 950    by the vectorizer, and return the decl of the target builtin
 951    function.  */
 952 DEFHOOK
 953 (builtin_mask_for_load,
 954  "",
 955  tree, (void), NULL)
 956
 957 /* Returns a code for builtin that realizes vectorized version of
 958    function, or NULL_TREE if not available.  */
 959 DEFHOOK
 960 (builtin_vectorized_function,
 961  "",
 962  tree, (tree fndecl, tree vec_type_out, tree vec_type_in),
 963  default_builtin_vectorized_function)
 964
 965 /* Returns a function declaration for a builtin that realizes the
 966    vector conversion, or NULL_TREE if not available.  */
 967 DEFHOOK
 968 (builtin_conversion,
 969  "",
 970  tree, (unsigned code, tree dest_type, tree src_type),
 971  default_builtin_vectorized_conversion)
 972
 973 /* Target builtin that implements vector widening multiplication.
 974    builtin_mul_widen_eve computes the element-by-element products
 975    for the even elements, and builtin_mul_widen_odd computes the
 976    element-by-element products for the odd elements.  */
 977 DEFHOOK
 978 (builtin_mul_widen_even,
 979  "",
 980  tree, (tree x), NULL)
 981
 982 DEFHOOK
 983 (builtin_mul_widen_odd,
 984  "",
 985  tree, (tree x), NULL)
 986
 987 /* Cost of different vector/scalar statements in vectorization cost
 988    model. In case of misaligned vector loads and stores the cost depends
 989    on the data type and misalignment value.  */
 990 DEFHOOK
 991 (builtin_vectorization_cost,
 992  "",
 993  int, (enum vect_cost_for_stmt type_of_cost, tree vectype, int misalign),
 994  default_builtin_vectorization_cost)
 995
 996 /* Return true if vector alignment is reachable (by peeling N
 997    iterations) for the given type.  */
 998 DEFHOOK
 999 (vector_alignment_reachable,
1000  "",
1001  bool, (const_tree type, bool is_packed),
1002  default_builtin_vector_alignment_reachable)
1003
1004 /* Return true if a vector created for vec_perm_const is valid.
1005    A NULL indicates that all constants are valid permutations.  */
1006 DEFHOOK
1007 (vec_perm_const_ok,
1008  "",
1009  bool, (enum machine_mode, const unsigned char *sel),
1010  NULL)
1011
1012 /* Return true if the target supports misaligned store/load of a
1013    specific factor denoted in the third parameter.  The last parameter
1014    is true if the access is defined in a packed struct.  */
1015 DEFHOOK
1016 (support_vector_misalignment,
1017  "",
1018  bool,
1019  (enum machine_mode mode, const_tree type, int misalignment, bool is_packed),
1020  default_builtin_support_vector_misalignment)
1021
1022 /* Return the builtin decl needed to load a vector of TYPE.  */
1023 DEFHOOK
1024 (builtin_tm_load,
1025  "This hook should return the built-in decl needed to load a vector of the "
1026  "given type within a transaction.",
1027  tree,
1028  (tree),
1029  default_builtin_tm_load_store)
1030
1031 /* Return the builtin decl needed to store a vector of TYPE.  */
1032 DEFHOOK
1033 (builtin_tm_store,
1034  "This hook should return the built-in decl needed to store a vector of the "
1035  "given type within a transaction.",
1036  tree,
1037  (tree),
1038  default_builtin_tm_load_store)
1039
1040 /* Returns the preferred mode for SIMD operations for the specified
1041    scalar mode.  */
1042 DEFHOOK
1043 (preferred_simd_mode,
1044  "",
1045  enum machine_mode,
1046  (enum machine_mode mode),
1047  default_preferred_simd_mode)
1048
1049 /* Returns a mask of vector sizes to iterate over when auto-vectorizing
1050    after processing the preferred one derived from preferred_simd_mode.  */
1051 DEFHOOK
1052 (autovectorize_vector_sizes,
1053  "",
1054  unsigned int,
1055  (void),
1056  default_autovectorize_vector_sizes)
1057
1058 /* Target builtin that implements vector gather operation.  */
1059 DEFHOOK
1060 (builtin_gather,
1061  "",
1062  tree,
1063  (const_tree mem_vectype, const_tree index_type, int scale),
1064  NULL)
1065
1066 HOOK_VECTOR_END (vectorize)
1067
1068 #undef HOOK_PREFIX
1069 #define HOOK_PREFIX "TARGET_"
1070
1071 /* Allow target specific overriding of option settings after options have
1072   been changed by an attribute or pragma or when it is reset at the
1073   end of the code affected by an attribute or pragma.  */
1074 DEFHOOK
1075 (override_options_after_change,
1076  "",
1077  void, (void),
1078  hook_void_void)
1079
1080 DEFHOOK_UNDOC
1081 (eh_return_filter_mode,
1082  "Return machine mode for filter value.",
1083  enum machine_mode, (void),
1084  default_eh_return_filter_mode)
1085
1086 /* Return machine mode for libgcc expanded cmp instructions.  */
1087 DEFHOOK
1088 (libgcc_cmp_return_mode,
1089  "",
1090  enum machine_mode, (void),
1091  default_libgcc_cmp_return_mode)
1092
1093 /* Return machine mode for libgcc expanded shift instructions.  */
1094 DEFHOOK
1095 (libgcc_shift_count_mode,
1096  "",
1097  enum machine_mode, (void),
1098  default_libgcc_shift_count_mode)
1099
1100 /* Return machine mode to be used for _Unwind_Word type.  */
1101 DEFHOOK
1102 (unwind_word_mode,
1103  "",
1104  enum machine_mode, (void),
1105  default_unwind_word_mode)
1106
1107 /* Given two decls, merge their attributes and return the result.  */
1108 DEFHOOK
1109 (merge_decl_attributes,
1110  "",
1111  tree, (tree olddecl, tree newdecl),
1112  merge_decl_attributes)
1113
1114 /* Given two types, merge their attributes and return the result.  */
1115 DEFHOOK
1116 (merge_type_attributes,
1117  "",
1118  tree, (tree type1, tree type2),
1119  merge_type_attributes)
1120
1121 /* Table of machine attributes and functions to handle them.
1122    Ignored if NULL.  */
1123 DEFHOOKPOD
1124 (attribute_table,
1125  "",
1126  const struct attribute_spec *, NULL)
1127
1128 /* Return true iff attribute NAME expects a plain identifier as its first
1129    argument.  */
1130 DEFHOOK
1131 (attribute_takes_identifier_p,
1132  "",
1133  bool, (const_tree name),
1134  hook_bool_const_tree_false)
1135
1136 /* Return zero if the attributes on TYPE1 and TYPE2 are incompatible,
1137    one if they are compatible and two if they are nearly compatible
1138    (which causes a warning to be generated).  */
1139 DEFHOOK
1140 (comp_type_attributes,
1141  "",
1142  int, (const_tree type1, const_tree type2),
1143  hook_int_const_tree_const_tree_1)
1144
1145 /* Assign default attributes to the newly defined TYPE.  */
1146 DEFHOOK
1147 (set_default_type_attributes,
1148  "",
1149  void, (tree type),
1150  hook_void_tree)
1151
1152 /* Insert attributes on the newly created DECL.  */
1153 DEFHOOK
1154 (insert_attributes,
1155  "",
1156  void, (tree node, tree *attr_ptr),
1157  hook_void_tree_treeptr)
1158
1159 /* Return true if FNDECL (which has at least one machine attribute)
1160    can be inlined despite its machine attributes, false otherwise.  */
1161 DEFHOOK
1162 (function_attribute_inlinable_p,
1163  "",
1164  bool, (const_tree fndecl),
1165  hook_bool_const_tree_false)
1166
1167 /* Return true if bitfields in RECORD_TYPE should follow the
1168    Microsoft Visual C++ bitfield layout rules.  */
1169 DEFHOOK
1170 (ms_bitfield_layout_p,
1171  "",
1172  bool, (const_tree record_type),
1173  hook_bool_const_tree_false)
1174
1175 /* For now this is only an interface to WORDS_BIG_ENDIAN for
1176    target-independent code like the front ends, need performance testing
1177    before switching completely to the target hook.  */
1178 DEFHOOK_UNDOC
1179 (words_big_endian,
1180  "",
1181  bool, (void),
1182  targhook_words_big_endian)
1183
1184 /* Likewise for FLOAT_WORDS_BIG_ENDIAN.  */
1185 DEFHOOK_UNDOC
1186 (float_words_big_endian,
1187  "",
1188  bool, (void),
1189  targhook_float_words_big_endian)
1190
1191 /* True if the target supports decimal floating point.  */
1192 DEFHOOK
1193 (decimal_float_supported_p,
1194  "",
1195  bool, (void),
1196  default_decimal_float_supported_p)
1197
1198 /* True if the target supports fixed-point.  */
1199 DEFHOOK
1200 (fixed_point_supported_p,
1201  "",
1202  bool, (void),
1203  default_fixed_point_supported_p)
1204
1205 /* Return true if anonymous bitfields affect structure alignment.  */
1206 DEFHOOK
1207 (align_anon_bitfield,
1208  "",
1209  bool, (void),
1210  hook_bool_void_false)
1211
1212 /* Return true if volatile bitfields should use the narrowest type possible.
1213    Return false if they should use the container type.  */
1214 DEFHOOK
1215 (narrow_volatile_bitfield,
1216  "",
1217  bool, (void),
1218  hook_bool_void_false)
1219
1220 /* Set up target-specific built-in functions.  */
1221 DEFHOOK
1222 (init_builtins,
1223  "",
1224  void, (void),
1225  hook_void_void)
1226
1227 /* Initialize (if INITIALIZE_P is true) and return the target-specific
1228    built-in function decl for CODE.
1229    Return NULL if that is not possible.  Return error_mark_node if CODE
1230    is outside of the range of valid target builtin function codes.  */
1231 DEFHOOK
1232 (builtin_decl,
1233  "",
1234  tree, (unsigned code, bool initialize_p), NULL)
1235
1236 /* Expand a target-specific builtin.  */
1237 DEFHOOK
1238 (expand_builtin,
1239  "",
1240  rtx,
1241  (tree exp, rtx target, rtx subtarget, enum machine_mode mode, int ignore),
1242  default_expand_builtin)
1243
1244 /* Select a replacement for a target-specific builtin.  This is done
1245    *before* regular type checking, and so allows the target to
1246    implement a crude form of function overloading.  The result is a
1247    complete expression that implements the operation.  PARAMS really
1248    has type VEC(tree,gc)*, but we don't want to include tree.h here.  */
1249 DEFHOOK
1250 (resolve_overloaded_builtin,
1251  "",
1252  tree, (unsigned int /*location_t*/ loc, tree fndecl, void *arglist), NULL)
1253
1254 /* Fold a target-specific builtin.  */
1255 DEFHOOK
1256 (fold_builtin,
1257  "",
1258  tree, (tree fndecl, int n_args, tree *argp, bool ignore),
1259  hook_tree_tree_int_treep_bool_null)
1260
1261 /* Returns a code for a target-specific builtin that implements
1262    reciprocal of the function, or NULL_TREE if not available.  */
1263 DEFHOOK
1264 (builtin_reciprocal,
1265  "",
1266  tree, (unsigned fn, bool md_fn, bool sqrt),
1267  default_builtin_reciprocal)
1268
1269 /* For a vendor-specific TYPE, return a pointer to a statically-allocated
1270    string containing the C++ mangling for TYPE.  In all other cases, return
1271    NULL.  */
1272 DEFHOOK
1273 (mangle_type,
1274  "",
1275  const char *, (const_tree type),
1276  hook_constcharptr_const_tree_null)
1277
1278 /* Make any adjustments to libfunc names needed for this target.  */
1279 DEFHOOK
1280 (init_libfuncs,
1281  "",
1282  void, (void),
1283  hook_void_void)
1284
1285  /* Add a __gnu_ prefix to library functions rather than just __.  */
1286 DEFHOOKPOD
1287 (libfunc_gnu_prefix,
1288  "If false (the default), internal library routines start with two\n\
1289 underscores.  If set to true, these routines start with @code{__gnu_}\n\
1290 instead.  E.g., @code{__muldi3} changes to @code{__gnu_muldi3}.  This\n\
1291 currently only affects functions defined in @file{libgcc2.c}.  If this\n\
1292 is set to true, the @file{tm.h} file must also\n\
1293 @code{#define LIBGCC2_GNU_PREFIX}.",
1294   bool, false)
1295
1296 /* Given a decl, a section name, and whether the decl initializer
1297    has relocs, choose attributes for the section.  */
1298 /* ??? Should be merged with SELECT_SECTION and UNIQUE_SECTION.  */
1299 DEFHOOK
1300 (section_type_flags,
1301  "",
1302  unsigned int, (tree decl, const char *name, int reloc),
1303  default_section_type_flags)
1304
1305 /* True if new jumps cannot be created, to replace existing ones or
1306    not, at the current point in the compilation.  */
1307 DEFHOOK
1308 (cannot_modify_jumps_p,
1309  "",
1310  bool, (void),
1311  hook_bool_void_false)
1312
1313 /* Return a register class for which branch target register
1314    optimizations should be applied.  */
1315 DEFHOOK
1316 (branch_target_register_class,
1317  "",
1318  reg_class_t, (void),
1319  default_branch_target_register_class)
1320
1321 /* Return true if branch target register optimizations should include
1322    callee-saved registers that are not already live during the current
1323    function.  AFTER_PE_GEN is true if prologues and epilogues have
1324    already been generated.  */
1325 DEFHOOK
1326 (branch_target_register_callee_saved,
1327  "",
1328  bool, (bool after_prologue_epilogue_gen),
1329  hook_bool_bool_false)
1330
1331 /* Return true if the target supports conditional execution.  */
1332 DEFHOOK
1333 (have_conditional_execution,
1334  "",
1335  bool, (void),
1336  default_have_conditional_execution)
1337
1338 /* Return a new value for loop unroll size.  */
1339 DEFHOOK
1340 (loop_unroll_adjust,
1341  "",
1342  unsigned, (unsigned nunroll, struct loop *loop),
1343  NULL)
1344
1345 /* True if X is a legitimate MODE-mode immediate operand.  */
1346 DEFHOOK
1347 (legitimate_constant_p,
1348  "",
1349  bool, (enum machine_mode mode, rtx x),
1350  hook_bool_mode_rtx_true)
1351
1352 /* True if the constant X cannot be placed in the constant pool.  */
1353 DEFHOOK
1354 (cannot_force_const_mem,
1355  "",
1356  bool, (enum machine_mode mode, rtx x),
1357  hook_bool_mode_rtx_false)
1358
1359 DEFHOOK_UNDOC
1360 (cannot_copy_insn_p,
1361  "True if the insn @var{x} cannot be duplicated.",
1362  bool, (rtx), NULL)
1363
1364 /* True if X is considered to be commutative.  */
1365 DEFHOOK
1366 (commutative_p,
1367  "",
1368  bool, (const_rtx x, int outer_code),
1369  hook_bool_const_rtx_commutative_p)
1370
1371 /* True if ADDR is an address-expression whose effect depends
1372    on the mode of the memory reference it is used in.  */
1373 DEFHOOK
1374 (mode_dependent_address_p,
1375  "",
1376  bool, (const_rtx addr),
1377  default_mode_dependent_address_p)
1378
1379 /* Given an invalid address X for a given machine mode, try machine-specific
1380    ways to make it legitimate.  Return X or an invalid address on failure.  */
1381 DEFHOOK
1382 (legitimize_address,
1383  "",
1384  rtx, (rtx x, rtx oldx, enum machine_mode mode),
1385  default_legitimize_address)
1386
1387 /* Given an address RTX, undo the effects of LEGITIMIZE_ADDRESS.  */
1388 DEFHOOK
1389 (delegitimize_address,
1390  "",
1391  rtx, (rtx x),
1392  delegitimize_mem_from_attrs)
1393
1394 /* Given an RTX, return true if it is not ok to emit it into debug info
1395    section.  */
1396 DEFHOOK
1397 (const_not_ok_for_debug_p,
1398  "",
1399  bool, (rtx x),
1400  hook_bool_rtx_false)
1401
1402 /* Given an address RTX, say whether it is valid.  */
1403 DEFHOOK
1404 (legitimate_address_p,
1405  "",
1406  bool, (enum machine_mode mode, rtx x, bool strict),
1407  default_legitimate_address_p)
1408
1409 /* True if the given constant can be put into an object_block.  */
1410 DEFHOOK
1411 (use_blocks_for_constant_p,
1412  "",
1413  bool, (enum machine_mode mode, const_rtx x),
1414  hook_bool_mode_const_rtx_false)
1415
1416 /* The minimum and maximum byte offsets for anchored addresses.  */
1417 DEFHOOKPOD
1418 (min_anchor_offset,
1419  "",
1420  HOST_WIDE_INT, 0)
1421
1422 DEFHOOKPOD
1423 (max_anchor_offset,
1424  "",
1425  HOST_WIDE_INT, 0)
1426
1427 /* True if section anchors can be used to access the given symbol.  */
1428 DEFHOOK
1429 (use_anchors_for_symbol_p,
1430  "",
1431  bool, (const_rtx x),
1432  default_use_anchors_for_symbol_p)
1433
1434 /* True if it is OK to do sibling call optimization for the specified
1435    call expression EXP.  DECL will be the called function, or NULL if
1436    this is an indirect call.  */
1437 DEFHOOK
1438 (function_ok_for_sibcall,
1439  "",
1440  bool, (tree decl, tree exp),
1441  hook_bool_tree_tree_false)
1442
1443 /* Establish appropriate back-end context for processing the function
1444    FNDECL.  The argument might be NULL to indicate processing at top
1445    level, outside of any function scope.  */
1446 DEFHOOK
1447 (set_current_function,
1448  "",
1449  void, (tree decl), hook_void_tree)
1450
1451 /* True if EXP should be placed in a "small data" section.  */
1452 DEFHOOK
1453 (in_small_data_p,
1454  "",
1455  bool, (const_tree exp),
1456  hook_bool_const_tree_false)
1457
1458 /* True if EXP names an object for which name resolution must resolve
1459    to the current executable or shared library.  */
1460 DEFHOOK
1461 (binds_local_p,
1462  "",
1463  bool, (const_tree exp),
1464  default_binds_local_p)
1465
1466 /* Check if profiling code is before or after prologue.  */
1467 DEFHOOK
1468 (profile_before_prologue,
1469  "It returns true if target wants profile code emitted before prologue.\n\n\
1470 The default version of this hook use the target macro\n\
1471 @code{PROFILE_BEFORE_PROLOGUE}.",
1472  bool, (void),
1473  default_profile_before_prologue)
1474
1475 /* Modify and return the identifier of a DECL's external name,
1476    originally identified by ID, as required by the target,
1477    (eg, append @nn to windows32 stdcall function names).
1478    The default is to return ID without modification. */
1479 DEFHOOK
1480 (mangle_decl_assembler_name,
1481  "",
1482  tree, (tree decl, tree  id),
1483  default_mangle_decl_assembler_name)
1484
1485 /* Do something target-specific to record properties of the DECL into
1486    the associated SYMBOL_REF.  */
1487 DEFHOOK
1488 (encode_section_info,
1489  "",
1490  void, (tree decl, rtx rtl, int new_decl_p),
1491  default_encode_section_info)
1492
1493 /* Undo the effects of encode_section_info on the symbol string.  */
1494 DEFHOOK
1495 (strip_name_encoding,
1496  "",
1497  const char *, (const char *name),
1498  default_strip_name_encoding)
1499
1500 /* If shift optabs for MODE are known to always truncate the shift count,
1501    return the mask that they apply.  Return 0 otherwise.  */
1502 DEFHOOK
1503 (shift_truncation_mask,
1504  "",
1505  unsigned HOST_WIDE_INT, (enum machine_mode mode),
1506  default_shift_truncation_mask)
1507
1508 /* Return the number of divisions in the given MODE that should be present,
1509    so that it is profitable to turn the division into a multiplication by
1510    the reciprocal.  */
1511 DEFHOOK
1512 (min_divisions_for_recip_mul,
1513  "",
1514  unsigned int, (enum machine_mode mode),
1515  default_min_divisions_for_recip_mul)
1516
1517 /* If the representation of integral MODE is such that values are
1518    always sign-extended to a wider mode MODE_REP then return
1519    SIGN_EXTEND.  Return UNKNOWN otherwise.  */
1520 /* Note that the return type ought to be RTX_CODE, but that's not
1521    necessarily defined at this point.  */
1522 DEFHOOK
1523 (mode_rep_extended,
1524  "",
1525  int, (enum machine_mode mode, enum machine_mode rep_mode),
1526  default_mode_rep_extended)
1527
1528 /* True if MODE is valid for a pointer in __attribute__((mode("MODE"))).  */
1529 DEFHOOK
1530 (valid_pointer_mode,
1531  "",
1532  bool, (enum machine_mode mode),
1533  default_valid_pointer_mode)
1534
1535 /* Disambiguate with errno.  */
1536 DEFHOOK
1537 (ref_may_alias_errno,
1538  "Define this to return nonzero if the memory reference @var{ref}\
1539   may alias with the system C library errno location.  The default\
1540   version of this hook assumes the system C library errno location\
1541   is either a declaration of type int or accessed by dereferencing\
1542   a pointer to int.",
1543  bool, (struct ao_ref_s *ref),
1544  default_ref_may_alias_errno)
1545
1546 /* Support for named address spaces.  */
1547 #undef HOOK_PREFIX
1548 #define HOOK_PREFIX "TARGET_ADDR_SPACE_"
1549 HOOK_VECTOR (TARGET_ADDR_SPACE_HOOKS, addr_space)
1550
1551 /* MODE to use for a pointer into another address space.  */
1552 DEFHOOK
1553 (pointer_mode,
1554  "",
1555  enum machine_mode, (addr_space_t address_space),
1556  default_addr_space_pointer_mode)
1557
1558 /* MODE to use for an address in another address space.  */
1559 DEFHOOK
1560 (address_mode,
1561  "",
1562  enum machine_mode, (addr_space_t address_space),
1563  default_addr_space_address_mode)
1564
1565 /* True if MODE is valid for a pointer in __attribute__((mode("MODE")))
1566    in another address space.  */
1567 DEFHOOK
1568 (valid_pointer_mode,
1569  "",
1570  bool, (enum machine_mode mode, addr_space_t as),
1571  default_addr_space_valid_pointer_mode)
1572
1573 /* True if an address is a valid memory address to a given named address
1574    space for a given mode.  */
1575 DEFHOOK
1576 (legitimate_address_p,
1577  "",
1578  bool, (enum machine_mode mode, rtx exp, bool strict, addr_space_t as),
1579  default_addr_space_legitimate_address_p)
1580
1581 /* Return an updated address to convert an invalid pointer to a named
1582    address space to a valid one.  If NULL_RTX is returned use machine
1583    independent methods to make the address valid.  */
1584 DEFHOOK
1585 (legitimize_address,
1586  "",
1587  rtx, (rtx x, rtx oldx, enum machine_mode mode, addr_space_t as),
1588  default_addr_space_legitimize_address)
1589
1590 /* True if one named address space is a subset of another named address. */
1591 DEFHOOK
1592 (subset_p,
1593  "",
1594  bool, (addr_space_t subset, addr_space_t superset),
1595  default_addr_space_subset_p)
1596
1597 /* Function to convert an rtl expression from one address space to another.  */
1598 DEFHOOK
1599 (convert,
1600  "",
1601  rtx, (rtx op, tree from_type, tree to_type),
1602  default_addr_space_convert)
1603
1604 HOOK_VECTOR_END (addr_space)
1605
1606 #undef HOOK_PREFIX
1607 #define HOOK_PREFIX "TARGET_"
1608
1609 /* True if MODE is valid for the target.  By "valid", we mean able to
1610    be manipulated in non-trivial ways.  In particular, this means all
1611    the arithmetic is supported.  */
1612 DEFHOOK
1613 (scalar_mode_supported_p,
1614  "",
1615  bool, (enum machine_mode mode),
1616  default_scalar_mode_supported_p)
1617
1618 /* Similarly for vector modes.  "Supported" here is less strict.  At
1619    least some operations are supported; need to check optabs or builtins
1620    for further details.  */
1621 DEFHOOK
1622 (vector_mode_supported_p,
1623  "",
1624  bool, (enum machine_mode mode),
1625  hook_bool_mode_false)
1626
1627 /* True if we should try to use a scalar mode to represent an array,
1628    overriding the usual MAX_FIXED_MODE limit.  */
1629 DEFHOOK
1630 (array_mode_supported_p,
1631  "Return true if GCC should try to use a scalar mode to store an array\n\
1632 of @var{nelems} elements, given that each element has mode @var{mode}.\n\
1633 Returning true here overrides the usual @code{MAX_FIXED_MODE} limit\n\
1634 and allows GCC to use any defined integer mode.\n\
1635 \n\
1636 One use of this hook is to support vector load and store operations\n\
1637 that operate on several homogeneous vectors.  For example, ARM NEON\n\
1638 has operations like:\n\
1639 \n\
1640 @smallexample\n\
1641 int8x8x3_t vld3_s8 (const int8_t *)\n\
1642 @end smallexample\n\
1643 \n\
1644 where the return type is defined as:\n\
1645 \n\
1646 @smallexample\n\
1647 typedef struct int8x8x3_t\n\
1648 @{\n\
1649   int8x8_t val[3];\n\
1650 @} int8x8x3_t;\n\
1651 @end smallexample\n\
1652 \n\
1653 If this hook allows @code{val} to have a scalar mode, then\n\
1654 @code{int8x8x3_t} can have the same mode.  GCC can then store\n\
1655 @code{int8x8x3_t}s in registers rather than forcing them onto the stack.",
1656  bool, (enum machine_mode mode, unsigned HOST_WIDE_INT nelems),
1657  hook_bool_mode_uhwi_false)
1658
1659 /* Compute cost of moving data from a register of class FROM to one of
1660    TO, using MODE.  */
1661 DEFHOOK
1662 (register_move_cost,
1663  "",
1664  int, (enum machine_mode mode, reg_class_t from, reg_class_t to),
1665  default_register_move_cost)
1666
1667 /* Compute cost of moving registers to/from memory.  */
1668 /* ??? Documenting the argument types for this hook requires a GFDL
1669    license grant.  Also, the documentation uses a different name for RCLASS.  */
1670 DEFHOOK
1671 (memory_move_cost,
1672  "",
1673  int, (enum machine_mode mode, reg_class_t rclass, bool in),
1674  default_memory_move_cost)
1675
1676 /* True for MODE if the target expects that registers in this mode will
1677    be allocated to registers in a small register class.  The compiler is
1678    allowed to use registers explicitly used in the rtl as spill registers
1679    but it should prevent extending the lifetime of these registers.  */
1680 DEFHOOK
1681 (small_register_classes_for_mode_p,
1682  "",
1683  bool, (enum machine_mode mode),
1684  hook_bool_mode_false)
1685
1686 /* Register number for a flags register.  Only needs to be defined if the
1687    target is constrainted to use post-reload comparison elimination.  */
1688 DEFHOOKPOD
1689 (flags_regnum,
1690  "If the target has a dedicated flags register, and it needs to use the\
1691  post-reload comparison elimination pass, then this value should be set\
1692  appropriately.",
1693  unsigned int, INVALID_REGNUM)
1694
1695 /* Compute a (partial) cost for rtx X.  Return true if the complete
1696    cost has been computed, and false if subexpressions should be
1697    scanned.  In either case, *TOTAL contains the cost result.  */
1698 /* Note that CODE and OUTER_CODE ought to be RTX_CODE, but that's
1699    not necessarily defined at this point.  */
1700 DEFHOOK
1701 (rtx_costs,
1702  "",
1703  bool, (rtx x, int code, int outer_code, int opno, int *total, bool speed),
1704  hook_bool_rtx_int_int_int_intp_bool_false)
1705
1706 /* Compute the cost of X, used as an address.  Never called with
1707    invalid addresses.  */
1708 DEFHOOK
1709 (address_cost,
1710  "",
1711  int, (rtx address, bool speed),
1712  default_address_cost)
1713
1714 /* Return where to allocate pseudo for a given hard register initial value.  */
1715 DEFHOOK
1716 (allocate_initial_value,
1717  "",
1718  rtx, (rtx hard_reg), NULL)
1719
1720 /* Return nonzero if evaluating UNSPEC[_VOLATILE] X might cause a trap.
1721    FLAGS has the same meaning as in rtlanal.c: may_trap_p_1.  */
1722 DEFHOOK
1723 (unspec_may_trap_p,
1724  "",
1725  int, (const_rtx x, unsigned flags),
1726  default_unspec_may_trap_p)
1727
1728 /* Given a register, this hook should return a parallel of registers
1729    to represent where to find the register pieces.  Define this hook
1730    if the register and its mode are represented in Dwarf in
1731    non-contiguous locations, or if the register should be
1732    represented in more than one register in Dwarf.  Otherwise, this
1733    hook should return NULL_RTX.  */
1734 DEFHOOK
1735 (dwarf_register_span,
1736  "",
1737  rtx, (rtx reg),
1738  hook_rtx_rtx_null)
1739
1740 /* If expand_builtin_init_dwarf_reg_sizes needs to fill in table
1741    entries not corresponding directly to registers below
1742    FIRST_PSEUDO_REGISTER, this hook should generate the necessary
1743    code, given the address of the table.  */
1744 DEFHOOK
1745 (init_dwarf_reg_sizes_extra,
1746  "",
1747  void, (tree address),
1748  hook_void_tree)
1749
1750 /* Fetch the fixed register(s) which hold condition codes, for
1751    targets where it makes sense to look for duplicate assignments to
1752    the condition codes.  This should return true if there is such a
1753    register, false otherwise.  The arguments should be set to the
1754    fixed register numbers.  Up to two condition code registers are
1755    supported.  If there is only one for this target, the int pointed
1756    at by the second argument should be set to -1.  */
1757 DEFHOOK
1758 (fixed_condition_code_regs,
1759  "",
1760  bool, (unsigned int *p1, unsigned int *p2),
1761  hook_bool_uintp_uintp_false)
1762
1763 /* If two condition code modes are compatible, return a condition
1764      code mode which is compatible with both, such that a comparison
1765      done in the returned mode will work for both of the original
1766      modes.  If the condition code modes are not compatible, return
1767      VOIDmode.  */
1768 DEFHOOK
1769 (cc_modes_compatible,
1770  "",
1771  enum machine_mode, (enum machine_mode m1, enum machine_mode m2),
1772  default_cc_modes_compatible)
1773
1774 /* Do machine-dependent code transformations.  Called just before
1775      delayed-branch scheduling.  */
1776 DEFHOOK
1777 (machine_dependent_reorg,
1778  "",
1779  void, (void), NULL)
1780
1781 /* Create the __builtin_va_list type.  */
1782 DEFHOOK
1783 (build_builtin_va_list,
1784  "",
1785  tree, (void),
1786  std_build_builtin_va_list)
1787
1788 /* Enumerate the va list variants.  */
1789 DEFHOOK
1790 (enum_va_list_p,
1791  "",
1792  int, (int idx, const char **pname, tree *ptree),
1793  NULL)
1794
1795 /* Get the cfun/fndecl calling abi __builtin_va_list type.  */
1796 DEFHOOK
1797 (fn_abi_va_list,
1798  "",
1799  tree, (tree fndecl),
1800  std_fn_abi_va_list)
1801
1802 /* Get the __builtin_va_list type dependent on input type.  */
1803 DEFHOOK
1804 (canonical_va_list_type,
1805  "",
1806  tree, (tree type),
1807  std_canonical_va_list_type)
1808
1809 /* ??? Documenting this hook requires a GFDL license grant.  */
1810 DEFHOOK_UNDOC
1811 (expand_builtin_va_start,
1812 "Expand the @code{__builtin_va_start} builtin.",
1813  void, (tree valist, rtx nextarg), NULL)
1814
1815 /* Gimplifies a VA_ARG_EXPR.  */
1816 DEFHOOK
1817 (gimplify_va_arg_expr,
1818  "",
1819  tree, (tree valist, tree type, gimple_seq *pre_p, gimple_seq *post_p),
1820  std_gimplify_va_arg_expr)
1821
1822 /* Validity-checking routines for PCH files, target-specific.
1823    get_pch_validity returns a pointer to the data to be stored,
1824    and stores the size in its argument.  pch_valid_p gets the same
1825    information back and returns NULL if the PCH is valid,
1826    or an error message if not.  */
1827 DEFHOOK
1828 (get_pch_validity,
1829  "",
1830  void *, (size_t *sz),
1831  default_get_pch_validity)
1832
1833 DEFHOOK
1834 (pch_valid_p,
1835  "",
1836  const char *, (const void *data, size_t sz),
1837  default_pch_valid_p)
1838
1839 DEFHOOK
1840 (prepare_pch_save,
1841  "Called before writing out a PCH file.  If the target has some\n\
1842 garbage-collected data that needs to be in a particular state on PCH loads,\n\
1843 it can use this hook to enforce that state.  Very few targets need\n\
1844 to do anything here.",
1845  void, (void),
1846  hook_void_void)
1847
1848 /* If nonnull, this function checks whether a PCH file with the
1849    given set of target flags can be used.  It returns NULL if so,
1850    otherwise it returns an error message.  */
1851 DEFHOOK
1852 (check_pch_target_flags,
1853  "",
1854  const char *, (int pch_flags), NULL)
1855
1856 /* True if the compiler should give an enum type only as many
1857    bytes as it takes to represent the range of possible values of
1858    that type.  */
1859 DEFHOOK
1860 (default_short_enums,
1861  "",
1862  bool, (void),
1863  hook_bool_void_false)
1864
1865 /* This target hook returns an rtx that is used to store the address
1866    of the current frame into the built-in setjmp buffer.  */
1867 DEFHOOK
1868 (builtin_setjmp_frame_value,
1869  "",
1870  rtx, (void),
1871  default_builtin_setjmp_frame_value)
1872
1873 /* This target hook should add STRING_CST trees for any hard regs
1874    the port wishes to automatically clobber for an asm.  */
1875 DEFHOOK
1876 (md_asm_clobbers,
1877  "",
1878  tree, (tree outputs, tree inputs, tree clobbers),
1879  hook_tree_tree_tree_tree_3rd_identity)
1880
1881 /* This target hook allows the backend to specify a calling convention
1882    in the debug information.  This function actually returns an
1883    enum dwarf_calling_convention, but because of forward declarations
1884    and not wanting to include dwarf2.h everywhere target.h is included
1885    the function is being declared as an int.  */
1886 DEFHOOK
1887 (dwarf_calling_convention,
1888  "",
1889  int, (const_tree function),
1890  hook_int_const_tree_0)
1891
1892 /* This target hook allows the backend to emit frame-related insns that
1893    contain UNSPECs or UNSPEC_VOLATILEs.  The call frame debugging info
1894    engine will invoke it on insns of the form
1895      (set (reg) (unspec [...] UNSPEC_INDEX))
1896    and
1897      (set (reg) (unspec_volatile [...] UNSPECV_INDEX))
1898    to let the backend emit the call frame instructions.  */
1899 DEFHOOK
1900 (dwarf_handle_frame_unspec,
1901  "",
1902  void, (const char *label, rtx pattern, int index), NULL)
1903
1904 /* ??? Documenting this hook requires a GFDL license grant.  */
1905 DEFHOOK_UNDOC
1906 (stdarg_optimize_hook,
1907 "Perform architecture specific checking of statements gimplified\
1908  from @code{VA_ARG_EXPR}.  @var{stmt} is the statement.  Returns true if\
1909  the statement doesn't need to be checked for @code{va_list} references.",
1910  bool, (struct stdarg_info *ai, const_gimple stmt), NULL)
1911
1912 /* This target hook allows the operating system to override the DECL
1913    that represents the external variable that contains the stack
1914    protection guard variable.  The type of this DECL is ptr_type_node.  */
1915 DEFHOOK
1916 (stack_protect_guard,
1917  "",
1918  tree, (void),
1919  default_stack_protect_guard)
1920
1921 /* This target hook allows the operating system to override the CALL_EXPR
1922    that is invoked when a check vs the guard variable fails.  */
1923 DEFHOOK
1924 (stack_protect_fail,
1925  "",
1926  tree, (void),
1927  default_external_stack_protect_fail)
1928
1929 /* Returns NULL if target supports the insn within a doloop block,
1930    otherwise it returns an error message.  */
1931 DEFHOOK
1932 (invalid_within_doloop,
1933  "",
1934  const char *, (const_rtx insn),
1935  default_invalid_within_doloop)
1936
1937 DEFHOOK
1938 (valid_dllimport_attribute_p,
1939 "@var{decl} is a variable or function with @code{__attribute__((dllimport))}\
1940  specified.  Use this hook if the target needs to add extra validation\
1941  checks to @code{handle_dll_attribute}.",
1942  bool, (const_tree decl),
1943  hook_bool_const_tree_true)
1944
1945 /* If non-zero, align constant anchors in CSE to a multiple of this
1946    value.  */
1947 DEFHOOKPOD
1948 (const_anchor,
1949  "",
1950  unsigned HOST_WIDE_INT, 0)
1951
1952 /* Defines, which target-dependent bits (upper 16) are used by port  */
1953 DEFHOOK
1954 (memmodel_check,
1955  "",
1956  unsigned HOST_WIDE_INT, (unsigned HOST_WIDE_INT val), NULL)
1957
1958 /* Functions relating to calls - argument passing, returns, etc.  */
1959 /* Members of struct call have no special macro prefix.  */
1960 HOOK_VECTOR (TARGET_CALLS, calls)
1961
1962 DEFHOOK
1963 (promote_function_mode,
1964  "",
1965  enum machine_mode, (const_tree type, enum machine_mode mode, int *punsignedp,
1966                      const_tree funtype, int for_return),
1967  default_promote_function_mode)
1968
1969 DEFHOOK
1970 (promote_prototypes,
1971  "",
1972  bool, (const_tree fntype),
1973  hook_bool_const_tree_false)
1974
1975 DEFHOOK
1976 (struct_value_rtx,
1977  "",
1978  rtx, (tree fndecl, int incoming),
1979  hook_rtx_tree_int_null)
1980 DEFHOOK
1981 (return_in_memory,
1982  "",
1983  bool, (const_tree type, const_tree fntype),
1984  default_return_in_memory)
1985
1986 DEFHOOK
1987 (return_in_msb,
1988  "",
1989  bool, (const_tree type),
1990  hook_bool_const_tree_false)
1991
1992 /* Return true if a parameter must be passed by reference.  TYPE may
1993    be null if this is a libcall.  CA may be null if this query is
1994    from __builtin_va_arg.  */
1995 DEFHOOK
1996 (pass_by_reference,
1997  "",
1998  bool,
1999  (cumulative_args_t cum, enum machine_mode mode, const_tree type, bool named),
2000  hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false)
2001
2002 DEFHOOK
2003 (expand_builtin_saveregs,
2004  "",
2005  rtx, (void),
2006  default_expand_builtin_saveregs)
2007
2008 /* Returns pretend_argument_size.  */
2009 DEFHOOK
2010 (setup_incoming_varargs,
2011  "",
2012  void, (cumulative_args_t args_so_far, enum machine_mode mode, tree type,
2013         int *pretend_args_size, int second_time),
2014  default_setup_incoming_varargs)
2015
2016 DEFHOOK
2017 (strict_argument_naming,
2018  "",
2019  bool, (cumulative_args_t ca),
2020  hook_bool_CUMULATIVE_ARGS_false)
2021
2022 /* Returns true if we should use
2023    targetm.calls.setup_incoming_varargs() and/or
2024    targetm.calls.strict_argument_naming().  */
2025 DEFHOOK
2026 (pretend_outgoing_varargs_named,
2027  "",
2028  bool, (cumulative_args_t ca),
2029  default_pretend_outgoing_varargs_named)
2030
2031 /* Given a complex type T, return true if a parameter of type T
2032    should be passed as two scalars.  */
2033 DEFHOOK
2034 (split_complex_arg,
2035  "",
2036  bool, (const_tree type), NULL)
2037
2038 /* Return true if type T, mode MODE, may not be passed in registers,
2039    but must be passed on the stack.  */
2040 /* ??? This predicate should be applied strictly after pass-by-reference.
2041    Need audit to verify that this is the case.  */
2042 DEFHOOK
2043 (must_pass_in_stack,
2044  "",
2045  bool, (enum machine_mode mode, const_tree type),
2046  must_pass_in_stack_var_size_or_pad)
2047
2048 /* Return true if type TYPE, mode MODE, which is passed by reference,
2049    should have the object copy generated by the callee rather than
2050    the caller.  It is never called for TYPE requiring constructors.  */
2051 DEFHOOK
2052 (callee_copies,
2053  "",
2054  bool,
2055  (cumulative_args_t cum, enum machine_mode mode, const_tree type, bool named),
2056  hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false)
2057
2058 /* Return zero for arguments passed entirely on the stack or entirely
2059    in registers.  If passed in both, return the number of bytes passed
2060    in registers; the balance is therefore passed on the stack.  */
2061 DEFHOOK
2062 (arg_partial_bytes,
2063  "",
2064  int, (cumulative_args_t cum, enum machine_mode mode, tree type, bool named),
2065  hook_int_CUMULATIVE_ARGS_mode_tree_bool_0)
2066
2067 /* Update the state in CA to advance past an argument in the
2068    argument list.  The values MODE, TYPE, and NAMED describe that
2069    argument.  */
2070 DEFHOOK
2071 (function_arg_advance,
2072  "",
2073  void,
2074  (cumulative_args_t ca, enum machine_mode mode, const_tree type, bool named),
2075  default_function_arg_advance)
2076
2077 /* Return zero if the argument described by the state of CA should
2078    be placed on a stack, or a hard register in which to store the
2079    argument.  The values MODE, TYPE, and NAMED describe that
2080    argument.  */
2081 DEFHOOK
2082 (function_arg,
2083  "",
2084  rtx, (cumulative_args_t ca, enum machine_mode mode, const_tree type,
2085        bool named),
2086  default_function_arg)
2087
2088 /* Likewise, but for machines with register windows.  Return the
2089    location where the argument will appear to the callee.  */
2090 DEFHOOK
2091 (function_incoming_arg,
2092  "",
2093  rtx, (cumulative_args_t ca, enum machine_mode mode, const_tree type,
2094        bool named),
2095  default_function_incoming_arg)
2096
2097 DEFHOOK
2098 (function_arg_boundary,
2099  "",
2100  unsigned int, (enum machine_mode mode, const_tree type),
2101  default_function_arg_boundary)
2102
2103 DEFHOOK
2104 (function_arg_round_boundary,
2105  "Normally, the size of an argument is rounded up to @code{PARM_BOUNDARY},\n\
2106 which is the default value for this hook.  You can define this hook to\n\
2107 return a different value if an argument size must be rounded to a larger\n\
2108 value.",
2109  unsigned int, (enum machine_mode mode, const_tree type),
2110  default_function_arg_round_boundary)
2111
2112 /* Return the diagnostic message string if function without a prototype
2113    is not allowed for this 'val' argument; NULL otherwise. */
2114 DEFHOOK
2115 (invalid_arg_for_unprototyped_fn,
2116  "",
2117  const char *, (const_tree typelist, const_tree funcdecl, const_tree val),
2118  hook_invalid_arg_for_unprototyped_fn)
2119
2120 /* Return an rtx for the return value location of the function
2121    specified by FN_DECL_OR_TYPE with a return type of RET_TYPE.  */
2122 DEFHOOK
2123 (function_value,
2124  "",
2125  rtx, (const_tree ret_type, const_tree fn_decl_or_type, bool outgoing),
2126  default_function_value)
2127
2128 /* Return the rtx for the result of a libcall of mode MODE,
2129    calling the function FN_NAME.  */
2130 DEFHOOK
2131 (libcall_value,
2132  "",
2133  rtx, (enum machine_mode mode, const_rtx fun),
2134  default_libcall_value)
2135
2136 /* Return true if REGNO is a possible register number for
2137    a function value as seen by the caller.  */
2138 DEFHOOK
2139 (function_value_regno_p,
2140  "",
2141  bool, (const unsigned int regno),
2142  default_function_value_regno_p)
2143
2144 /* ??? Documenting this hook requires a GFDL license grant.  */
2145 DEFHOOK_UNDOC
2146 (internal_arg_pointer,
2147 "Return an rtx for the argument pointer incoming to the\
2148  current function.",
2149  rtx, (void),
2150  default_internal_arg_pointer)
2151
2152 /* Update the current function stack boundary if needed.  */
2153 DEFHOOK
2154 (update_stack_boundary,
2155  "",
2156  void, (void), NULL)
2157
2158 /* Handle stack alignment and return an rtx for Dynamic Realign
2159    Argument Pointer if necessary.  */
2160 DEFHOOK
2161 (get_drap_rtx,
2162  "",
2163  rtx, (void), NULL)
2164
2165 /* Return true if all function parameters should be spilled to the
2166    stack.  */
2167 DEFHOOK
2168 (allocate_stack_slots_for_args,
2169  "",
2170  bool, (void),
2171  hook_bool_void_true)
2172
2173 /* Return an rtx for the static chain for FNDECL.  If INCOMING_P is true,
2174        then it should be for the callee; otherwise for the caller.  */
2175 DEFHOOK
2176 (static_chain,
2177  "",
2178  rtx, (const_tree fndecl, bool incoming_p),
2179  default_static_chain)
2180
2181 /* Fill in the trampoline at MEM with a call to FNDECL and a
2182    static chain value of CHAIN.  */
2183 DEFHOOK
2184 (trampoline_init,
2185  "",
2186  void, (rtx m_tramp, tree fndecl, rtx static_chain),
2187  default_trampoline_init)
2188
2189 /* Adjust the address of the trampoline in a target-specific way.  */
2190 DEFHOOK
2191 (trampoline_adjust_address,
2192  "",
2193  rtx, (rtx addr), NULL)
2194
2195 /* Return the number of bytes of its own arguments that a function
2196    pops on returning, or 0 if the function pops no arguments and the
2197    caller must therefore pop them all after the function returns.  */
2198 /* ??? tm.texi has no types for the parameters.  */
2199 DEFHOOK
2200 (return_pops_args,
2201  "",
2202  int, (tree fundecl, tree funtype, int size),
2203  default_return_pops_args)
2204
2205 /* Return a mode wide enough to copy any function value that might be
2206    returned.  */
2207 DEFHOOK
2208 (get_raw_result_mode,
2209  "This target hook returns the mode to be used when accessing raw return\
2210  registers in @code{__builtin_return}.  Define this macro if the value\
2211  in @var{reg_raw_mode} is not correct.",
2212  enum machine_mode, (int regno),
2213  default_get_reg_raw_mode)
2214
2215 /* Return a mode wide enough to copy any argument value that might be
2216    passed.  */
2217 DEFHOOK
2218 (get_raw_arg_mode,
2219  "This target hook returns the mode to be used when accessing raw argument\
2220  registers in @code{__builtin_apply_args}.  Define this macro if the value\
2221  in @var{reg_raw_mode} is not correct.",
2222  enum machine_mode, (int regno),
2223  default_get_reg_raw_mode)
2224
2225 HOOK_VECTOR_END (calls)
2226
2227 /* Return the diagnostic message string if conversion from FROMTYPE
2228    to TOTYPE is not allowed, NULL otherwise.  */
2229 DEFHOOK
2230 (invalid_conversion,
2231  "",
2232  const char *, (const_tree fromtype, const_tree totype),
2233  hook_constcharptr_const_tree_const_tree_null)
2234
2235 /* Return the diagnostic message string if the unary operation OP is
2236    not permitted on TYPE, NULL otherwise.  */
2237 DEFHOOK
2238 (invalid_unary_op,
2239  "",
2240  const char *, (int op, const_tree type),
2241  hook_constcharptr_int_const_tree_null)
2242
2243 /* Return the diagnostic message string if the binary operation OP
2244    is not permitted on TYPE1 and TYPE2, NULL otherwise.  */
2245 DEFHOOK
2246 (invalid_binary_op,
2247  "",
2248  const char *, (int op, const_tree type1, const_tree type2),
2249  hook_constcharptr_int_const_tree_const_tree_null)
2250
2251 /* Return the diagnostic message string if TYPE is not valid as a
2252    function parameter type, NULL otherwise.  */
2253 DEFHOOK
2254 (invalid_parameter_type,
2255  "",
2256  const char *, (const_tree type),
2257  hook_constcharptr_const_tree_null)
2258
2259 /* Return the diagnostic message string if TYPE is not valid as a
2260    function return type, NULL otherwise.  */
2261 DEFHOOK
2262 (invalid_return_type,
2263  "",
2264  const char *, (const_tree type),
2265  hook_constcharptr_const_tree_null)
2266
2267 /* If values of TYPE are promoted to some other type when used in
2268    expressions (analogous to the integer promotions), return that type,
2269    or NULL_TREE otherwise.  */
2270 DEFHOOK
2271 (promoted_type,
2272  "",
2273  tree, (const_tree type),
2274  hook_tree_const_tree_null)
2275
2276 /* Convert EXPR to TYPE, if target-specific types with special conversion
2277    rules are involved.  Return the converted expression, or NULL to apply
2278    the standard conversion rules.  */
2279 DEFHOOK
2280 (convert_to_type,
2281  "",
2282  tree, (tree type, tree expr),
2283  hook_tree_tree_tree_null)
2284
2285 /* Return the class for a secondary reload, and fill in extra information.  */
2286 DEFHOOK
2287 (secondary_reload,
2288  "",
2289  reg_class_t,
2290  (bool in_p, rtx x, reg_class_t reload_class, enum machine_mode reload_mode,
2291   secondary_reload_info *sri),
2292  default_secondary_reload)
2293
2294 /* Given an rtx X being reloaded into a reg required to be in class CLASS,
2295    return the class of reg to actually use.  */
2296 DEFHOOK
2297 (preferred_reload_class,
2298  "",
2299  reg_class_t,
2300  (rtx x, reg_class_t rclass),
2301  default_preferred_reload_class)
2302
2303 /* Like TARGET_PREFERRED_RELOAD_CLASS, but for output reloads instead of
2304    input reloads.  */
2305 DEFHOOK
2306 (preferred_output_reload_class,
2307  "",
2308  reg_class_t,
2309  (rtx x, reg_class_t rclass),
2310  default_preferred_output_reload_class)
2311
2312 DEFHOOK
2313 (class_likely_spilled_p,
2314  "",
2315  bool, (reg_class_t rclass),
2316  default_class_likely_spilled_p)
2317
2318 /* Return the maximum number of consecutive registers
2319    needed to represent mode MODE in a register of class RCLASS.  */
2320 DEFHOOK
2321 (class_max_nregs,
2322  "",
2323  unsigned char, (reg_class_t rclass, enum machine_mode mode),
2324  default_class_max_nregs)
2325
2326 DEFHOOK
2327 (preferred_rename_class,
2328  "A target hook that places additional preference on the register\
2329  class to use when it is necessary to rename a register in class\
2330  @var{rclass} to another class, or perhaps @var{NO_REGS}, if no\
2331  preferred register class is found or hook @code{preferred_rename_class}\
2332  is not implemented.\
2333  Sometimes returning a more restrictive class makes better code.  For\
2334  example, on ARM, thumb-2 instructions using @code{LO_REGS} may be\
2335  smaller than instructions using @code{GENERIC_REGS}.  By returning\
2336  @code{LO_REGS} from @code{preferred_rename_class}, code size can\
2337  be reduced.",
2338  reg_class_t, (reg_class_t rclass),
2339  default_preferred_rename_class)
2340
2341 /* This target hook allows the backend to perform additional
2342    processing while initializing for variable expansion.  */
2343 DEFHOOK
2344 (expand_to_rtl_hook,
2345  "",
2346  void, (void),
2347  hook_void_void)
2348
2349 /* This target hook allows the backend to perform additional
2350    instantiations on rtx that are not actually in insns yet,
2351    but will be later.  */
2352 DEFHOOK
2353 (instantiate_decls,
2354  "",
2355  void, (void),
2356  hook_void_void)
2357
2358 /* Return true if is OK to use a hard register REGNO as scratch register
2359    in peephole2.  */
2360 DEFHOOK
2361 (hard_regno_scratch_ok,
2362  "",
2363  bool, (unsigned int regno),
2364  default_hard_regno_scratch_ok)
2365
2366 /* Return the smallest number of different values for which it is best to
2367    use a jump-table instead of a tree of conditional branches.  */
2368 DEFHOOK
2369 (case_values_threshold,
2370  "",
2371  unsigned int, (void),
2372  default_case_values_threshold)
2373
2374 /* Retutn true if a function must have and use a frame pointer.  */
2375 DEFHOOK
2376 (frame_pointer_required,
2377  "",
2378  bool, (void),
2379  hook_bool_void_false)
2380
2381 /* Returns true if the compiler is allowed to try to replace register number
2382    from-reg with register number to-reg.  */
2383 DEFHOOK
2384 (can_eliminate,
2385  "",
2386  bool, (const int from_reg, const int to_reg),
2387  hook_bool_const_int_const_int_true)
2388
2389 /* Modify any or all of fixed_regs, call_used_regs, global_regs,
2390    reg_names, and reg_class_contents to account of the vagaries of the
2391    target.  */
2392 DEFHOOK
2393 (conditional_register_usage,
2394  "",
2395  void, (void),
2396  hook_void_void)
2397
2398 /* Functions specific to the C family of frontends.  */
2399 #undef HOOK_PREFIX
2400 #define HOOK_PREFIX "TARGET_C_"
2401 HOOK_VECTOR (TARGET_C, c)
2402
2403 /* ??? Documenting this hook requires a GFDL license grant.  */
2404 DEFHOOK_UNDOC
2405 (mode_for_suffix,
2406 "Return machine mode for non-standard constant literal suffix @var{c},\
2407  or VOIDmode if non-standard suffixes are unsupported.",
2408  enum machine_mode, (char c),
2409  default_mode_for_suffix)
2410
2411 HOOK_VECTOR_END (c)
2412
2413 /* Functions specific to the C++ frontend.  */
2414 #undef HOOK_PREFIX
2415 #define HOOK_PREFIX "TARGET_CXX_"
2416 HOOK_VECTOR (TARGET_CXX, cxx)
2417
2418 /* Return the integer type used for guard variables.  */
2419 DEFHOOK
2420 (guard_type,
2421  "",
2422  tree, (void),
2423  default_cxx_guard_type)
2424
2425 /* Return true if only the low bit of the guard should be tested.  */
2426 DEFHOOK
2427 (guard_mask_bit,
2428  "",
2429  bool, (void),
2430  hook_bool_void_false)
2431
2432 /* Returns the size of the array cookie for an array of type.  */
2433 DEFHOOK
2434 (get_cookie_size,
2435  "",
2436  tree, (tree type),
2437  default_cxx_get_cookie_size)
2438
2439 /* Returns true if the element size should be stored in the array cookie.  */
2440 DEFHOOK
2441 (cookie_has_size,
2442  "",
2443  bool, (void),
2444  hook_bool_void_false)
2445
2446 /* Allows backends to perform additional processing when
2447    deciding if a class should be exported or imported.  */
2448 DEFHOOK
2449 (import_export_class,
2450  "",
2451  int, (tree type, int import_export), NULL)
2452
2453 /* Returns true if constructors and destructors return "this".  */
2454 DEFHOOK
2455 (cdtor_returns_this,
2456  "",
2457  bool, (void),
2458  hook_bool_void_false)
2459
2460 /* Returns true if the key method for a class can be an inline
2461    function, so long as it is not declared inline in the class
2462    itself.  Returning true is the behavior required by the Itanium C++ ABI.  */
2463 DEFHOOK
2464 (key_method_may_be_inline,
2465  "",
2466  bool, (void),
2467  hook_bool_void_true)
2468
2469 DEFHOOK
2470 (determine_class_data_visibility,
2471 "@var{decl} is a virtual table, virtual table table, typeinfo object,\
2472  or other similar implicit class data object that will be emitted with\
2473  external linkage in this translation unit.  No ELF visibility has been\
2474  explicitly specified.  If the target needs to specify a visibility\
2475  other than that of the containing class, use this hook to set\
2476  @code{DECL_VISIBILITY} and @code{DECL_VISIBILITY_SPECIFIED}.",
2477  void, (tree decl),
2478  hook_void_tree)
2479
2480 /* Returns true (the default) if virtual tables and other
2481    similar implicit class data objects are always COMDAT if they
2482    have external linkage.  If this hook returns false, then
2483    class data for classes whose virtual table will be emitted in
2484    only one translation unit will not be COMDAT.  */
2485 DEFHOOK
2486 (class_data_always_comdat,
2487  "",
2488  bool, (void),
2489  hook_bool_void_true)
2490
2491 /* Returns true (the default) if the RTTI for the basic types,
2492    which is always defined in the C++ runtime, should be COMDAT;
2493    false if it should not be COMDAT.  */
2494 DEFHOOK
2495 (library_rtti_comdat,
2496  "",
2497  bool, (void),
2498  hook_bool_void_true)
2499
2500 /* Returns true if __aeabi_atexit should be used to register static
2501    destructors.  */
2502 DEFHOOK
2503 (use_aeabi_atexit,
2504  "",
2505  bool, (void),
2506  hook_bool_void_false)
2507
2508 /* Returns true if target may use atexit in the same manner as
2509    __cxa_atexit  to register static destructors.  */
2510 DEFHOOK
2511 (use_atexit_for_cxa_atexit,
2512  "",
2513  bool, (void),
2514  hook_bool_void_false)
2515
2516 DEFHOOK
2517 (adjust_class_at_definition,
2518 "@var{type} is a C++ class (i.e., RECORD_TYPE or UNION_TYPE) that has just\
2519  been defined.  Use this hook to make adjustments to the class (eg, tweak\
2520  visibility or perform any other required target modifications).",
2521  void, (tree type),
2522  hook_void_tree)
2523
2524 DEFHOOK
2525 (decl_mangling_context,
2526  "Return target-specific mangling context of @var{decl} or @code{NULL_TREE}.",
2527  tree, (const_tree decl),
2528  hook_tree_const_tree_null)
2529
2530 HOOK_VECTOR_END (cxx)
2531
2532 /* Functions and data for emulated TLS support.  */
2533 #undef HOOK_PREFIX
2534 #define HOOK_PREFIX "TARGET_EMUTLS_"
2535 HOOK_VECTOR (TARGET_EMUTLS, emutls)
2536
2537 /* Name of the address and common functions.  */
2538 DEFHOOKPOD
2539 (get_address,
2540  "",
2541  const char *, "__builtin___emutls_get_address")
2542
2543 DEFHOOKPOD
2544 (register_common,
2545  "",
2546  const char *, "__builtin___emutls_register_common")
2547
2548 /* Prefixes for proxy variable and template.  */
2549 DEFHOOKPOD
2550 (var_section,
2551  "",
2552  const char *, NULL)
2553
2554 DEFHOOKPOD
2555 (tmpl_section,
2556  "",
2557  const char *, NULL)
2558
2559 /* Prefixes for proxy variable and template.  */
2560 DEFHOOKPOD
2561 (var_prefix,
2562  "",
2563  const char *, NULL)
2564
2565 DEFHOOKPOD
2566 (tmpl_prefix,
2567  "",
2568  const char *, NULL)
2569
2570 /* Function to generate field definitions of the proxy variable.  */
2571 DEFHOOK
2572 (var_fields,
2573  "",
2574  tree, (tree type, tree *name),
2575  default_emutls_var_fields)
2576
2577 /* Function to initialize a proxy variable.  */
2578 DEFHOOK
2579 (var_init,
2580  "",
2581  tree, (tree var, tree decl, tree tmpl_addr),
2582  default_emutls_var_init)
2583
2584 /* Whether we are allowed to alter the usual alignment of the
2585    proxy variable.  */
2586 DEFHOOKPOD
2587 (var_align_fixed,
2588  "",
2589  bool, false)
2590
2591 /* Whether we can emit debug information for TLS vars.  */
2592 DEFHOOKPOD
2593 (debug_form_tls_address,
2594  "",
2595  bool, false)
2596
2597 HOOK_VECTOR_END (emutls)
2598
2599 #undef HOOK_PREFIX
2600 #define HOOK_PREFIX "TARGET_OPTION_"
2601 HOOK_VECTOR (TARGET_OPTION_HOOKS, target_option_hooks)
2602
2603 /* Function to validate the attribute((option(...))) strings or NULL.  If
2604    the option is validated, it is assumed that DECL_FUNCTION_SPECIFIC will
2605    be filled in in the function decl node.  */
2606 DEFHOOK
2607 (valid_attribute_p,
2608  "",
2609  bool, (tree fndecl, tree name, tree args, int flags),
2610  default_target_option_valid_attribute_p)
2611
2612 /* Function to save any extra target state in the target options structure.  */
2613 DEFHOOK
2614 (save,
2615  "",
2616  void, (struct cl_target_option *ptr), NULL)
2617
2618 /* Function to restore any extra target state from the target options
2619    structure.  */
2620 DEFHOOK
2621 (restore,
2622  "",
2623  void, (struct cl_target_option *ptr), NULL)
2624
2625 /* Function to print any extra target state from the target options
2626    structure.  */
2627 DEFHOOK
2628 (print,
2629  "",
2630  void, (FILE *file, int indent, struct cl_target_option *ptr), NULL)
2631
2632 /* Function to parse arguments to be validated for #pragma option, and to
2633    change the state if the options are valid.  If the first argument is
2634    NULL, the second argument specifies the default options to use.  Return
2635    true if the options are valid, and set the current state.  */
2636 /* ??? The documentation in tm.texi is incomplete.  */
2637 DEFHOOK
2638 (pragma_parse,
2639  "",
2640  bool, (tree args, tree pop_target),
2641  default_target_option_pragma_parse)
2642
2643 /* Do option overrides for the target.  */
2644 DEFHOOK
2645 (override,
2646  "",
2647  void, (void),
2648  hook_void_void)
2649
2650 /* Function to determine if one function can inline another function.  */
2651 #undef HOOK_PREFIX
2652 #define HOOK_PREFIX "TARGET_"
2653 DEFHOOK
2654 (can_inline_p,
2655  "",
2656  bool, (tree caller, tree callee),
2657  default_target_can_inline_p)
2658
2659 HOOK_VECTOR_END (target_option)
2660
2661 /* For targets that need to mark extra registers as live on entry to
2662    the function, they should define this target hook and set their
2663    bits in the bitmap passed in. */
2664 DEFHOOK
2665 (extra_live_on_entry,
2666  "",
2667  void, (bitmap regs),
2668  hook_void_bitmap)
2669
2670 /* Fill in additional registers set up by prologue into a regset.  */
2671 DEFHOOK
2672 (set_up_by_prologue,
2673  "This hook should add additional registers that are computed by the prologue\
2674  to the hard regset for shrink-wrapping optimization purposes.",
2675  void, (struct hard_reg_set_container *),
2676  NULL)
2677
2678 /* Determine the type of unwind info to emit for debugging.  */
2679 DEFHOOK
2680 (debug_unwind_info,
2681  "",
2682  enum unwind_info_type, (void),
2683  default_debug_unwind_info)
2684
2685 DEFHOOKPOD
2686 (atomic_test_and_set_trueval,
2687  "This value should be set if the result written by\
2688  @code{atomic_test_and_set} is not exactly 1, i.e. the\
2689  @code{bool} @code{true}.",
2690  unsigned char, 1)
2691
2692 /* Leave the boolean fields at the end.  */
2693
2694 /* True if we can create zeroed data by switching to a BSS section
2695    and then using ASM_OUTPUT_SKIP to allocate the space.  */
2696 DEFHOOKPOD
2697 (have_switchable_bss_sections,
2698  "",
2699  bool, false)
2700
2701 /* True if "native" constructors and destructors are supported,
2702    false if we're using collect2 for the job.  */
2703 DEFHOOKPOD
2704 (have_ctors_dtors,
2705  "",
2706  bool, false)
2707
2708 /* True if thread-local storage is supported.  */
2709 DEFHOOKPOD
2710 (have_tls,
2711  "",
2712  bool, false)
2713
2714 /* True if a small readonly data section is supported.  */
2715 DEFHOOKPOD
2716 (have_srodata_section,
2717  "",
2718  bool, false)
2719
2720 /* True if EH frame info sections should be zero-terminated.  */
2721 DEFHOOKPOD
2722 (terminate_dw2_eh_frame_info,
2723  "",
2724  bool, true)
2725
2726 /* True if #NO_APP should be emitted at the beginning of assembly output.  */
2727 DEFHOOKPOD
2728 (asm_file_start_app_off,
2729  "",
2730  bool, false)
2731
2732 /* True if output_file_directive should be called for main_input_filename
2733    at the beginning of assembly output.  */
2734 DEFHOOKPOD
2735 (asm_file_start_file_directive,
2736  "",
2737  bool, false)
2738
2739 /* True if the target is allowed to reorder memory accesses unless
2740    synchronization is explicitly requested.  */
2741 DEFHOOKPOD
2742 (relaxed_ordering,
2743  "",
2744  bool, false)
2745
2746 /* Returns true if we should generate exception tables for use with the
2747    ARM EABI.  The effects the encoding of function exception specifications.  */
2748 DEFHOOKPOD
2749 (arm_eabi_unwinder,
2750  "",
2751  bool, false)
2752
2753 DEFHOOKPOD
2754 (want_debug_pub_sections,
2755  "True if the @code{.debug_pubtypes} and @code{.debug_pubnames} sections\
2756  should be emitted.  These sections are not used on most platforms, and\
2757  in particular GDB does not use them.",
2758  bool, false)
2759
2760 DEFHOOKPOD
2761 (force_at_comp_dir,
2762  "True if the @code{DW_AT_comp_dir} attribute should be emitted for each \
2763  compilation unit.  This attribute is required for the darwin linker \
2764  to emit debug information.",
2765  bool, false)
2766
2767 DEFHOOKPOD
2768 (delay_sched2, "True if sched2 is not to be run at its normal place.  \
2769 This usually means it will be run as part of machine-specific reorg.",
2770 bool, false)
2771
2772 DEFHOOKPOD
2773 (delay_vartrack, "True if vartrack is not to be run at its normal place.  \
2774 This usually means it will be run as part of machine-specific reorg.",
2775 bool, false)
2776
2777 /* Leave the boolean fields at the end.  */
2778
2779 /* Close the 'struct gcc_target' definition.  */
2780 HOOK_VECTOR_END (C90_EMPTY_HACK)